Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4A10025-101A found under Valve Butterfly by Handy Tool And Mfg Co Inc The. The National Stock Number assigned to this part is 4820008334012, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4A10025-101A.